A shiny car is nice, in a way. But going for the shine too often - especially in winter - can lead to micro scratching unless you're very, very thorough with the de-gritting/de-mudding initially. Check around the front wheel lower bodyowrk - lots of inbedded grit quite often.
So, I have a winter regime & a summer regime. Winter is all about keeping salt/grit/muck away/off the car & protecting paint & metal - especially underneath & wheelarches.
Winter: Soak car with hose, remove grit/salt from underneath with hose - around suspension components,/axle, brakes hoses etc - and don't forget in & around the whole exhaust system. That gets the crap off. As my car's had a thick oilng underneath (not undersealing), I rarely use any de-greasant (car wash) there. The soaked car then hosed again to remove rough dirt, then very soft wash brush shampoo starting from top - I don't like sponges because they can hold grit & cause micro scratches.
I use a good quality wash & wax for this & take especial care on lower half of car where grit/tar sticks. I never polish or chamois in winter - just leave a layer of polish from the above wash/wax. Windows may get a glass cleaner applied & chamois all round. Remove carpets & hoover. Done.
Summer: All the above, except especial attention to front (insects/tar removal etc), then polish when car is grit/tar free, but I never chamois a car.
Generally: all washing done with copious warm/hot water, brush/cloth never re-applied without thorough rinsing. Wheels soaked, then hosed off & washed - all recesses cleaned.
My 'golden rules' : never rub/polish until car is completely clean/grit free. Winter is about stopping salt/grit/corrosion damage, not about 'showroom' shine. The underneath is just (if not more) important - that's where the 'oily bits' have work to do. Always asap, rinse/hose after snow/ice/salt etc, even if you don't wash that time.
Products: Buy the best cleaning solutions/polishes you can, use soft scrubbing/cleaning materials designed for car cleaning - i.e. no old rags etc. I don't believe in fancy or pricey 'miracle' clean-your-car-in-5-mniutes products - waste of money & encourage you to skimp the proper process.
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